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From: kernel test robot <lkp@intel.com>
To: kbuild-all@lists.01.org
Subject: [linux-next:master 4911/5794] include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask
Date: Mon, 16 Nov 2020 03:58:09 +0800	[thread overview]
Message-ID: <202011160303.qi5aRChY-lkp@intel.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 11897 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   92edc4aef86780a8ad01b092c6d6630bb3cb423d
commit: 4a2d447bea5bdb175e0defaefcba74fc1517dff0 [4911/5794] pwm: Add PWM driver for Intel Keem Bay
config: arm64-randconfig-p002-20201116 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=4a2d447bea5bdb175e0defaefcba74fc1517dff0
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 4a2d447bea5bdb175e0defaefcba74fc1517dff0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from drivers/pwm/pwm-keembay.c:16:
   In function 'field_multiplier',
       inlined from 'keembay_pwm_update_bits.isra.0' at include/linux/bitfield.h:124:17:
>> include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask
     119 |   __bad_mask();
         |   ^~~~~~~~~~~~
   In function 'field_multiplier',
       inlined from 'keembay_pwm_update_bits.isra.0' at include/linux/bitfield.h:154:1:
>> include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask
     119 |   __bad_mask();
         |   ^~~~~~~~~~~~

vim +/__bad_mask +119 include/linux/bitfield.h

3e9b3112ec74f19 Jakub Kicinski  2016-08-31   43  
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   44  #define __BF_FIELD_CHECK(_mask, _reg, _val, _pfx)			\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   45  	({								\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   46  		BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask),		\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   47  				 _pfx "mask is not constant");		\
e36488c83b6d871 Arnd Bergmann   2018-08-17   48  		BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero");	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   49  		BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?		\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   50  				 ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   51  				 _pfx "value too large for the field"); \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   52  		BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,		\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   53  				 _pfx "type of reg too small for mask"); \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   54  		__BUILD_BUG_ON_NOT_POWER_OF_2((_mask) +			\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   55  					      (1ULL << __bf_shf(_mask))); \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   56  	})
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   57  
e31a50162feb352 Alex Elder      2020-03-12   58  /**
e31a50162feb352 Alex Elder      2020-03-12   59   * FIELD_MAX() - produce the maximum value representable by a field
e31a50162feb352 Alex Elder      2020-03-12   60   * @_mask: shifted mask defining the field's length and position
e31a50162feb352 Alex Elder      2020-03-12   61   *
e31a50162feb352 Alex Elder      2020-03-12   62   * FIELD_MAX() returns the maximum value that can be held in the field
e31a50162feb352 Alex Elder      2020-03-12   63   * specified by @_mask.
e31a50162feb352 Alex Elder      2020-03-12   64   */
e31a50162feb352 Alex Elder      2020-03-12   65  #define FIELD_MAX(_mask)						\
e31a50162feb352 Alex Elder      2020-03-12   66  	({								\
e31a50162feb352 Alex Elder      2020-03-12   67  		__BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_MAX: ");	\
e31a50162feb352 Alex Elder      2020-03-12   68  		(typeof(_mask))((_mask) >> __bf_shf(_mask));		\
e31a50162feb352 Alex Elder      2020-03-12   69  	})
e31a50162feb352 Alex Elder      2020-03-12   70  
1697599ee301a52 Jakub Kicinski  2017-02-09   71  /**
1697599ee301a52 Jakub Kicinski  2017-02-09   72   * FIELD_FIT() - check if value fits in the field
1697599ee301a52 Jakub Kicinski  2017-02-09   73   * @_mask: shifted mask defining the field's length and position
1697599ee301a52 Jakub Kicinski  2017-02-09   74   * @_val:  value to test against the field
1697599ee301a52 Jakub Kicinski  2017-02-09   75   *
1697599ee301a52 Jakub Kicinski  2017-02-09   76   * Return: true if @_val can fit inside @_mask, false if @_val is too big.
1697599ee301a52 Jakub Kicinski  2017-02-09   77   */
1697599ee301a52 Jakub Kicinski  2017-02-09   78  #define FIELD_FIT(_mask, _val)						\
1697599ee301a52 Jakub Kicinski  2017-02-09   79  	({								\
444da3f52407d74 Jakub Kicinski  2020-08-10   80  		__BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_FIT: ");	\
1697599ee301a52 Jakub Kicinski  2017-02-09   81  		!((((typeof(_mask))_val) << __bf_shf(_mask)) & ~(_mask)); \
1697599ee301a52 Jakub Kicinski  2017-02-09   82  	})
1697599ee301a52 Jakub Kicinski  2017-02-09   83  
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   84  /**
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   85   * FIELD_PREP() - prepare a bitfield element
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   86   * @_mask: shifted mask defining the field's length and position
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   87   * @_val:  value to put in the field
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   88   *
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   89   * FIELD_PREP() masks and shifts up the value.  The result should
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   90   * be combined with other fields of the bitfield using logical OR.
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   91   */
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   92  #define FIELD_PREP(_mask, _val)						\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   93  	({								\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   94  		__BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   95  		((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask);	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   96  	})
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   97  
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   98  /**
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   99   * FIELD_GET() - extract a bitfield element
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  100   * @_mask: shifted mask defining the field's length and position
7240767450d6d83 Masahiro Yamada 2017-10-03  101   * @_reg:  value of entire bitfield
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  102   *
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  103   * FIELD_GET() extracts the field specified by @_mask from the
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  104   * bitfield passed in as @_reg by masking and shifting it down.
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  105   */
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  106  #define FIELD_GET(_mask, _reg)						\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  107  	({								\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  108  		__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: ");	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  109  		(typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask));	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  110  	})
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  111  
e7d4a95da86e0b0 Johannes Berg   2018-06-20  112  extern void __compiletime_error("value doesn't fit into mask")
00b0c9b82663ac4 Al Viro         2017-12-14  113  __field_overflow(void);
00b0c9b82663ac4 Al Viro         2017-12-14  114  extern void __compiletime_error("bad bitfield mask")
00b0c9b82663ac4 Al Viro         2017-12-14  115  __bad_mask(void);
00b0c9b82663ac4 Al Viro         2017-12-14  116  static __always_inline u64 field_multiplier(u64 field)
00b0c9b82663ac4 Al Viro         2017-12-14  117  {
00b0c9b82663ac4 Al Viro         2017-12-14  118  	if ((field | (field - 1)) & ((field | (field - 1)) + 1))
00b0c9b82663ac4 Al Viro         2017-12-14 @119  		__bad_mask();
00b0c9b82663ac4 Al Viro         2017-12-14  120  	return field & -field;
00b0c9b82663ac4 Al Viro         2017-12-14  121  }
00b0c9b82663ac4 Al Viro         2017-12-14  122  static __always_inline u64 field_mask(u64 field)
00b0c9b82663ac4 Al Viro         2017-12-14  123  {
00b0c9b82663ac4 Al Viro         2017-12-14  124  	return field / field_multiplier(field);
00b0c9b82663ac4 Al Viro         2017-12-14  125  }
e31a50162feb352 Alex Elder      2020-03-12  126  #define field_max(field)	((typeof(field))field_mask(field))
00b0c9b82663ac4 Al Viro         2017-12-14  127  #define ____MAKE_OP(type,base,to,from)					\
00b0c9b82663ac4 Al Viro         2017-12-14  128  static __always_inline __##type type##_encode_bits(base v, base field)	\
00b0c9b82663ac4 Al Viro         2017-12-14  129  {									\
e7d4a95da86e0b0 Johannes Berg   2018-06-20  130  	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
00b0c9b82663ac4 Al Viro         2017-12-14  131  		__field_overflow();					\
00b0c9b82663ac4 Al Viro         2017-12-14  132  	return to((v & field_mask(field)) * field_multiplier(field));	\
00b0c9b82663ac4 Al Viro         2017-12-14  133  }									\
00b0c9b82663ac4 Al Viro         2017-12-14  134  static __always_inline __##type type##_replace_bits(__##type old,	\
00b0c9b82663ac4 Al Viro         2017-12-14  135  					base val, base field)		\
00b0c9b82663ac4 Al Viro         2017-12-14  136  {									\
00b0c9b82663ac4 Al Viro         2017-12-14  137  	return (old & ~to(field)) | type##_encode_bits(val, field);	\
00b0c9b82663ac4 Al Viro         2017-12-14  138  }									\
00b0c9b82663ac4 Al Viro         2017-12-14  139  static __always_inline void type##p_replace_bits(__##type *p,		\
00b0c9b82663ac4 Al Viro         2017-12-14  140  					base val, base field)		\
00b0c9b82663ac4 Al Viro         2017-12-14  141  {									\
00b0c9b82663ac4 Al Viro         2017-12-14  142  	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
00b0c9b82663ac4 Al Viro         2017-12-14  143  }									\
00b0c9b82663ac4 Al Viro         2017-12-14  144  static __always_inline base type##_get_bits(__##type v, base field)	\
00b0c9b82663ac4 Al Viro         2017-12-14  145  {									\
00b0c9b82663ac4 Al Viro         2017-12-14  146  	return (from(v) & field)/field_multiplier(field);		\
00b0c9b82663ac4 Al Viro         2017-12-14  147  }
00b0c9b82663ac4 Al Viro         2017-12-14  148  #define __MAKE_OP(size)							\
00b0c9b82663ac4 Al Viro         2017-12-14  149  	____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu)	\
00b0c9b82663ac4 Al Viro         2017-12-14  150  	____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu)	\
00b0c9b82663ac4 Al Viro         2017-12-14  151  	____MAKE_OP(u##size,u##size,,)
37a3862e1238262 Johannes Berg   2018-06-20  152  ____MAKE_OP(u8,u8,,)
00b0c9b82663ac4 Al Viro         2017-12-14  153  __MAKE_OP(16)
00b0c9b82663ac4 Al Viro         2017-12-14  154  __MAKE_OP(32)
00b0c9b82663ac4 Al Viro         2017-12-14  155  __MAKE_OP(64)
00b0c9b82663ac4 Al Viro         2017-12-14  156  #undef __MAKE_OP
00b0c9b82663ac4 Al Viro         2017-12-14  157  #undef ____MAKE_OP
00b0c9b82663ac4 Al Viro         2017-12-14  158  

:::::: The code at line 119 was first introduced by commit
:::::: 00b0c9b82663ac42e5a09f58ce960f81f29d64ee Add primitives for manipulating bitfields both in host- and fixed-endian.

:::::: TO: Al Viro <viro@zeniv.linux.org.uk>
:::::: CC: Al Viro <viro@zeniv.linux.org.uk>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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WARNING: multiple messages have this Message-ID (diff)
From: kernel test robot <lkp@intel.com>
To: Vijayakannan Ayyathurai <vijayakannan.ayyathurai@intel.com>
Cc: kbuild-all@lists.01.org,
	"Linux Memory Management List" <linux-mm@kvack.org>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Lai, Poey Seng" <poey.seng.lai@intel.com>,
	"Vineetha G. Jaya Kumaran" <vineetha.g.jaya.kumaran@intel.com>,
	"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Subject: [linux-next:master 4911/5794] include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask
Date: Mon, 16 Nov 2020 03:58:09 +0800	[thread overview]
Message-ID: <202011160303.qi5aRChY-lkp@intel.com> (raw)

[-- Attachment #1: Type: text/plain, Size: 11735 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   92edc4aef86780a8ad01b092c6d6630bb3cb423d
commit: 4a2d447bea5bdb175e0defaefcba74fc1517dff0 [4911/5794] pwm: Add PWM driver for Intel Keem Bay
config: arm64-randconfig-p002-20201116 (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=4a2d447bea5bdb175e0defaefcba74fc1517dff0
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 4a2d447bea5bdb175e0defaefcba74fc1517dff0
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from drivers/pwm/pwm-keembay.c:16:
   In function 'field_multiplier',
       inlined from 'keembay_pwm_update_bits.isra.0' at include/linux/bitfield.h:124:17:
>> include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask
     119 |   __bad_mask();
         |   ^~~~~~~~~~~~
   In function 'field_multiplier',
       inlined from 'keembay_pwm_update_bits.isra.0' at include/linux/bitfield.h:154:1:
>> include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask
     119 |   __bad_mask();
         |   ^~~~~~~~~~~~

vim +/__bad_mask +119 include/linux/bitfield.h

3e9b3112ec74f19 Jakub Kicinski  2016-08-31   43  
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   44  #define __BF_FIELD_CHECK(_mask, _reg, _val, _pfx)			\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   45  	({								\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   46  		BUILD_BUG_ON_MSG(!__builtin_constant_p(_mask),		\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   47  				 _pfx "mask is not constant");		\
e36488c83b6d871 Arnd Bergmann   2018-08-17   48  		BUILD_BUG_ON_MSG((_mask) == 0, _pfx "mask is zero");	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   49  		BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?		\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   50  				 ~((_mask) >> __bf_shf(_mask)) & (_val) : 0, \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   51  				 _pfx "value too large for the field"); \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   52  		BUILD_BUG_ON_MSG((_mask) > (typeof(_reg))~0ull,		\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   53  				 _pfx "type of reg too small for mask"); \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   54  		__BUILD_BUG_ON_NOT_POWER_OF_2((_mask) +			\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   55  					      (1ULL << __bf_shf(_mask))); \
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   56  	})
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   57  
e31a50162feb352 Alex Elder      2020-03-12   58  /**
e31a50162feb352 Alex Elder      2020-03-12   59   * FIELD_MAX() - produce the maximum value representable by a field
e31a50162feb352 Alex Elder      2020-03-12   60   * @_mask: shifted mask defining the field's length and position
e31a50162feb352 Alex Elder      2020-03-12   61   *
e31a50162feb352 Alex Elder      2020-03-12   62   * FIELD_MAX() returns the maximum value that can be held in the field
e31a50162feb352 Alex Elder      2020-03-12   63   * specified by @_mask.
e31a50162feb352 Alex Elder      2020-03-12   64   */
e31a50162feb352 Alex Elder      2020-03-12   65  #define FIELD_MAX(_mask)						\
e31a50162feb352 Alex Elder      2020-03-12   66  	({								\
e31a50162feb352 Alex Elder      2020-03-12   67  		__BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_MAX: ");	\
e31a50162feb352 Alex Elder      2020-03-12   68  		(typeof(_mask))((_mask) >> __bf_shf(_mask));		\
e31a50162feb352 Alex Elder      2020-03-12   69  	})
e31a50162feb352 Alex Elder      2020-03-12   70  
1697599ee301a52 Jakub Kicinski  2017-02-09   71  /**
1697599ee301a52 Jakub Kicinski  2017-02-09   72   * FIELD_FIT() - check if value fits in the field
1697599ee301a52 Jakub Kicinski  2017-02-09   73   * @_mask: shifted mask defining the field's length and position
1697599ee301a52 Jakub Kicinski  2017-02-09   74   * @_val:  value to test against the field
1697599ee301a52 Jakub Kicinski  2017-02-09   75   *
1697599ee301a52 Jakub Kicinski  2017-02-09   76   * Return: true if @_val can fit inside @_mask, false if @_val is too big.
1697599ee301a52 Jakub Kicinski  2017-02-09   77   */
1697599ee301a52 Jakub Kicinski  2017-02-09   78  #define FIELD_FIT(_mask, _val)						\
1697599ee301a52 Jakub Kicinski  2017-02-09   79  	({								\
444da3f52407d74 Jakub Kicinski  2020-08-10   80  		__BF_FIELD_CHECK(_mask, 0ULL, 0ULL, "FIELD_FIT: ");	\
1697599ee301a52 Jakub Kicinski  2017-02-09   81  		!((((typeof(_mask))_val) << __bf_shf(_mask)) & ~(_mask)); \
1697599ee301a52 Jakub Kicinski  2017-02-09   82  	})
1697599ee301a52 Jakub Kicinski  2017-02-09   83  
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   84  /**
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   85   * FIELD_PREP() - prepare a bitfield element
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   86   * @_mask: shifted mask defining the field's length and position
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   87   * @_val:  value to put in the field
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   88   *
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   89   * FIELD_PREP() masks and shifts up the value.  The result should
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   90   * be combined with other fields of the bitfield using logical OR.
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   91   */
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   92  #define FIELD_PREP(_mask, _val)						\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   93  	({								\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   94  		__BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   95  		((typeof(_mask))(_val) << __bf_shf(_mask)) & (_mask);	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   96  	})
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   97  
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   98  /**
3e9b3112ec74f19 Jakub Kicinski  2016-08-31   99   * FIELD_GET() - extract a bitfield element
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  100   * @_mask: shifted mask defining the field's length and position
7240767450d6d83 Masahiro Yamada 2017-10-03  101   * @_reg:  value of entire bitfield
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  102   *
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  103   * FIELD_GET() extracts the field specified by @_mask from the
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  104   * bitfield passed in as @_reg by masking and shifting it down.
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  105   */
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  106  #define FIELD_GET(_mask, _reg)						\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  107  	({								\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  108  		__BF_FIELD_CHECK(_mask, _reg, 0U, "FIELD_GET: ");	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  109  		(typeof(_mask))(((_reg) & (_mask)) >> __bf_shf(_mask));	\
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  110  	})
3e9b3112ec74f19 Jakub Kicinski  2016-08-31  111  
e7d4a95da86e0b0 Johannes Berg   2018-06-20  112  extern void __compiletime_error("value doesn't fit into mask")
00b0c9b82663ac4 Al Viro         2017-12-14  113  __field_overflow(void);
00b0c9b82663ac4 Al Viro         2017-12-14  114  extern void __compiletime_error("bad bitfield mask")
00b0c9b82663ac4 Al Viro         2017-12-14  115  __bad_mask(void);
00b0c9b82663ac4 Al Viro         2017-12-14  116  static __always_inline u64 field_multiplier(u64 field)
00b0c9b82663ac4 Al Viro         2017-12-14  117  {
00b0c9b82663ac4 Al Viro         2017-12-14  118  	if ((field | (field - 1)) & ((field | (field - 1)) + 1))
00b0c9b82663ac4 Al Viro         2017-12-14 @119  		__bad_mask();
00b0c9b82663ac4 Al Viro         2017-12-14  120  	return field & -field;
00b0c9b82663ac4 Al Viro         2017-12-14  121  }
00b0c9b82663ac4 Al Viro         2017-12-14  122  static __always_inline u64 field_mask(u64 field)
00b0c9b82663ac4 Al Viro         2017-12-14  123  {
00b0c9b82663ac4 Al Viro         2017-12-14  124  	return field / field_multiplier(field);
00b0c9b82663ac4 Al Viro         2017-12-14  125  }
e31a50162feb352 Alex Elder      2020-03-12  126  #define field_max(field)	((typeof(field))field_mask(field))
00b0c9b82663ac4 Al Viro         2017-12-14  127  #define ____MAKE_OP(type,base,to,from)					\
00b0c9b82663ac4 Al Viro         2017-12-14  128  static __always_inline __##type type##_encode_bits(base v, base field)	\
00b0c9b82663ac4 Al Viro         2017-12-14  129  {									\
e7d4a95da86e0b0 Johannes Berg   2018-06-20  130  	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
00b0c9b82663ac4 Al Viro         2017-12-14  131  		__field_overflow();					\
00b0c9b82663ac4 Al Viro         2017-12-14  132  	return to((v & field_mask(field)) * field_multiplier(field));	\
00b0c9b82663ac4 Al Viro         2017-12-14  133  }									\
00b0c9b82663ac4 Al Viro         2017-12-14  134  static __always_inline __##type type##_replace_bits(__##type old,	\
00b0c9b82663ac4 Al Viro         2017-12-14  135  					base val, base field)		\
00b0c9b82663ac4 Al Viro         2017-12-14  136  {									\
00b0c9b82663ac4 Al Viro         2017-12-14  137  	return (old & ~to(field)) | type##_encode_bits(val, field);	\
00b0c9b82663ac4 Al Viro         2017-12-14  138  }									\
00b0c9b82663ac4 Al Viro         2017-12-14  139  static __always_inline void type##p_replace_bits(__##type *p,		\
00b0c9b82663ac4 Al Viro         2017-12-14  140  					base val, base field)		\
00b0c9b82663ac4 Al Viro         2017-12-14  141  {									\
00b0c9b82663ac4 Al Viro         2017-12-14  142  	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
00b0c9b82663ac4 Al Viro         2017-12-14  143  }									\
00b0c9b82663ac4 Al Viro         2017-12-14  144  static __always_inline base type##_get_bits(__##type v, base field)	\
00b0c9b82663ac4 Al Viro         2017-12-14  145  {									\
00b0c9b82663ac4 Al Viro         2017-12-14  146  	return (from(v) & field)/field_multiplier(field);		\
00b0c9b82663ac4 Al Viro         2017-12-14  147  }
00b0c9b82663ac4 Al Viro         2017-12-14  148  #define __MAKE_OP(size)							\
00b0c9b82663ac4 Al Viro         2017-12-14  149  	____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu)	\
00b0c9b82663ac4 Al Viro         2017-12-14  150  	____MAKE_OP(be##size,u##size,cpu_to_be##size,be##size##_to_cpu)	\
00b0c9b82663ac4 Al Viro         2017-12-14  151  	____MAKE_OP(u##size,u##size,,)
37a3862e1238262 Johannes Berg   2018-06-20  152  ____MAKE_OP(u8,u8,,)
00b0c9b82663ac4 Al Viro         2017-12-14  153  __MAKE_OP(16)
00b0c9b82663ac4 Al Viro         2017-12-14  154  __MAKE_OP(32)
00b0c9b82663ac4 Al Viro         2017-12-14  155  __MAKE_OP(64)
00b0c9b82663ac4 Al Viro         2017-12-14  156  #undef __MAKE_OP
00b0c9b82663ac4 Al Viro         2017-12-14  157  #undef ____MAKE_OP
00b0c9b82663ac4 Al Viro         2017-12-14  158  

:::::: The code at line 119 was first introduced by commit
:::::: 00b0c9b82663ac42e5a09f58ce960f81f29d64ee Add primitives for manipulating bitfields both in host- and fixed-endian.

:::::: TO: Al Viro <viro@zeniv.linux.org.uk>
:::::: CC: Al Viro <viro@zeniv.linux.org.uk>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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             reply	other threads:[~2020-11-15 19:58 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-15 19:58 kernel test robot [this message]
2020-11-15 19:58 ` [linux-next:master 4911/5794] include/linux/bitfield.h:119:3: error: call to '__bad_mask' declared with attribute error: bad bitfield mask kernel test robot
2020-11-16  9:08 ` [PATCH RFC] pwm: keembay: Fix build failure with -Os Uwe Kleine-König
2020-11-16  9:08   ` Uwe Kleine-König
2020-11-17 17:29   ` Ayyathurai, Vijayakannan
2020-11-17 17:29     ` Ayyathurai, Vijayakannan
2020-11-18  9:48     ` Uwe Kleine-König
2020-11-18  9:48       ` Uwe Kleine-König
2020-11-18 10:06   ` Uwe Kleine-König
2020-11-18 10:06     ` Uwe Kleine-König
2020-11-18 17:41     ` Ayyathurai, Vijayakannan
2020-11-18 17:41       ` Ayyathurai, Vijayakannan
2020-11-18 18:01       ` Thierry Reding
2020-11-18 18:01         ` Thierry Reding
2020-11-18 18:00   ` Thierry Reding
2020-11-18 18:00     ` Thierry Reding

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